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<A href="introduction6.htm">Debugging Tools for Windows (WinDbg, KD, CDB, NTSD)</A> &gt; <A href="debugger_reference.htm">Debugger Reference</A> &gt; <A href="debugger_commands.htm">Debugger Commands</A> &gt; <A href="kernel_mode_extensions.htm">Kernel-Mode Extension Commands</A> &gt; </div>
	<div id="winchm_template_title">!bpid</div>
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	<div id="winchm_template_content"><div id="mainSection"><p>The <b>!bpid</b> extension requests that a process on the target computer break into the debugger or requests that a user-mode debugger be attached to a process on the target computer.</p>
<pre class="syntax">
    <b>!bpid </b>[<i>Options</i>]<b> </b><i>PID</i> 
</pre>
<h2><a id="ddk__bpid_dbg"></a><a id="DDK__BPID_DBG"></a>Parameters</h2>
<p></p>
<dl>
<dt><a id="_______Option______"></a><a id="_______option______"></a><a id="_______OPTION______"></a>       <i>Option</i>      </dt>
<dd>
<p>Controls the additional activities of this command. </p>
<p>The valid values for <i>Option</i> appear in the following table.</p>
<table>
<tr>
<td>
<p><b>-a</b></p>
</td>
<td>
<p>Attaches a new user-mode debugger to the process specified by <i>PID</i>. The user-mode debugger runs on the target machine.</p>
</td>
</tr>
<tr>
<td>
<p><b>-s</b></p>
</td>
<td>
<p>Adds a breakpoint that occurs in the WinLogon process immediately before the break in the user-mode process specified by <i>PID</i>. This allows the user to verify the request before attempting the action.</p>
</td>
</tr>
<tr>
<td>
<p><b>-w</b></p>
</td>
<td>
<p>Stores the request in the memory in the target computer. The target system can then repeat the request, but this is not usually necessary.</p>
</td>
</tr>
</table>
<p> </p>
</dd>
<dt><a id="_______PID______"></a><a id="_______pid______"></a>       <i>PID</i>      </dt>
<dd>
<p>Specifies the process ID of the desired process on the target computer. If you are using this to control a user-mode debugger on the target computer, <i>PID</i> should be the process ID of the target application, not of the user-mode debugger. (Because process IDs are usually listed in decimal format, you might need to prefix this with <b>0n</b> or convert it to hexadecimal format.)</p>
</dd>
</dl>
<h3><a id="DLL"></a><a id="dll"></a>DLL</h3>
<table>
<tr>
<td>
<p><b>Windows 2000</b></p>
</td>
<td>
<p>Unavailable </p>
</td>
</tr>
<tr>
<td>
<p><b>Windows XP and later</b></p>
</td>
<td>
<p>
          Kdexts.dll
         </p>
</td>
</tr>
</table>
<p> </p>
<p>This extension command is supported on x86-based, x64-based, and Itanium-based target computers.</p>
<h2>Remarks</h2>
<p>This command is especially useful when redirecting input and output from a user-mode debugger to the kernel debugger. It causes the user-mode target application to break into the user-mode debugger, which in turn requests input from the kernel debugger. See <a href="#Bookmark1312">Controlling the User-Mode Debugger from the Kernel Debugger</a> for details.</p>
<p>If this command is used in another situation, the user-mode process calls <b>DbgBreakPoint</b>. This will usually break directly into the kernel debugger.</p>
<p>The <b>-s</b> option causes a break in WinLogon just before the break in the specified process occurs. This is useful if you want to perform debugging actions within WinLogon's process context. The <a href="#Bookmark1997"><b>g (Go)</b></a> command can then be used to move on to the second break.</p>
<p>Note that there are ways in which this extension can fail to execute:</p>
<ul>
<li>
<p> Lack of resources. The <b>!bpid</b> extension injects a thread into the target process, so the system must have enough resources to create a thread. Using the <b>-a</b> option requires even more system resources since <b>!bpid -a</b> must run a full instance of a debugger on the target computer. </p>
</li>
<li>
<p> The loader lock is already held. Both <b>!bpid</b> and <b>!bpid -a</b> require a thread to run in the target process in order to make it break into the debugger. If another thread is holding the loader lock, then the <b>!bpid</b> thread will not be able to run and a break into the debugger may not occur. Thus, if <b>!bpid</b> fails when there is enough user-mode memory available for the target process, it is possible that the loader lock is held.</p>
</li>
<li>
<p>Lack of permission. The operation of the !bpid extension requires permission sufficient for WinLogon to create a remote thread and attach a debugger to a given process.</p>
</li>
<li>
<p>No access to ntsd.exe. If ntsd.exe is not found in a commonly known path, !bpid will fail to set an appropriate PID. Note that ntsd.exe is not included by default with Windows Vista.</p></li></ul></div></div>	
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